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Dutta T, Sengupta S, Adhya S, Saha A, Sengupta D, Mondal R, Naskar S, Bhattacharjee S, Sengupta M. Identification of TNF-α as Major Susceptible Risk Locus for Vitiligo: A Systematic Review and Meta-Analysis Study in the Asian Population. Dermatology 2024; 240:376-386. [PMID: 38377977 DOI: 10.1159/000536480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 01/21/2024] [Indexed: 02/22/2024] Open
Abstract
INTRODUCTION Vitiligo is a common depigmentation disorder characterized by defined white patches on the skin and affecting around 0.5% to 2% of the general population. Genetic association studies have identified several pre-disposing genes and single nucleotide polymorphisms (SNPs) for vitiligo pathogenesis; nonetheless, the reports are often conflicting and rarely conclusive. This comprehensive meta-analysis study was designed to evaluate the effect of the risk variants on vitiligo aetiology and covariate stratified vitiligo risk in the Asian population, considering all the studies published so far. METHODS We followed a systematic and comprehensive search to identify the relevant vitiligo-related candidate gene association studies in PubMed using specific keywords. After data extraction, we calculated, for the variants involved, the study-level unadjusted odds ratio, standard errors, and 95% confidence intervals by using logistic regression with additive, dominant effect, and recessive models using R software package (R, 3.4.2) "metafor." Subgroup analysis was performed using logistic regression (generalized linear model; "glm") of disease status on subgroup-specific genotype counts. For a better understanding of the likely biological function of vitiligo-associated variant obtained through the meta-analysis, in silico functional analyses, through standard publicly available web tools, were also conducted. RESULTS Thirty-one vitiligo-associated case-control studies on eleven SNPs were analysed in our study. In the fixed-effect meta-analysis, one variant upstream of TNF-α gene: rs1800629 was found to be associated with vitiligo risk in the additive (p = 4.26E-06), dominant (p = 1.65E-7), and recessive (p = 0.000453) models. After Benjamini-Hochberg false discovery rate (FDR) correction, rs1800629/TNF-α was found to be significant at 5% FDR in the dominant (padj = 1.82E-6) and recessive models (padj = 0.0049). In silico characterization revealed the prioritized variant to be regulatory in nature and thus having potential to contribute towards vitiligo pathogenesis. CONCLUSION Our study constitutes the first comprehensive meta-analysis of candidate gene-based association studies reported in the whole of the Asian population, followed by an in silico analysis of the vitiligo-associated variant. According to the findings of our study, TNF-α single nucleotide variant rs1800629G>A has a risk association, potentially contributing to vitiligo pathogenesis in the Asian population.
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Affiliation(s)
- Tithi Dutta
- Department of Genetics, University of Calcutta, Kolkata, India
| | | | - Suchismita Adhya
- Department of Microbiology, University of Calcutta, Kolkata, India
| | - Arpan Saha
- Department of Genetics, University of Calcutta, Kolkata, India
| | | | - Ritisri Mondal
- Department of Genetics, University of Calcutta, Kolkata, India
| | - Swarnadru Naskar
- Department of Biotechnology, KIIT University, Bhubaneswar, India
| | | | - Mainak Sengupta
- Department of Genetics, University of Calcutta, Kolkata, India
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Zapata-Salazar NA, Kubelis-Lopez DE, Salinas-Santander MA, Sanchez-Dominguez CN, Xolalpa-Rosales AC, Gomez-Galindo ME, Ocampo-Candiani J. Association of rs4711998 of IL-17A, rs2275913 of IL-17A and rs763780 IL-17F gene polymorphisms with non-segmental vitiligo in a Mexican population. Arch Dermatol Res 2023; 315:447-454. [PMID: 35960353 DOI: 10.1007/s00403-022-02382-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 05/27/2022] [Accepted: 08/02/2022] [Indexed: 12/27/2022]
Abstract
Vitiligo is the most common depigmenting disease characterized by achromic macules due to selective loss of melanocytes. The pathogenesis remains poorly elucidated, and multiple hypotheses exist regarding its pathogenesis. Evidence suggests that stress on melanocytes can result in activation of the immune system, and involvement of both activated cluster of differentiation (CD8+) cytotoxic and CD4+ T cells in the dysfunction, depigmentation, and apoptosis of melanocytes. Recent studies show that the interleukin 17 (IL-17) axis plays a central role in the pathogenesis of the disease. IL-17 is an important regulatory effector cytokine in this pathway. The aim of this study was to evaluate the association of IL-17A rs4711998 (-832A/G), IL-17A rs2275913 (-197G/A), and IL-17F rs763780 (7488A/G) with vitiligo in a Northeastern Mexican population. This was a case-control study and included 116 patients with vitiligo and 116 control subjects. Genotype characterization of IL-17A rs4711998 (-832A/G), IL-17A rs2275913 (-197G/A), and IL-17F rs763780 (7488A/G) was performed using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method. A p ≤ 0.05 was considered significant. It was observed that the combination of the genotypes GG/GA for IL-17F rs763780 (7488A/G) was associated with an increased risk for the development of vitiligo (OR 2.0943, 95% Cl 1.2375-3.5445, p = 0.0056). Regarding IL-17A rs4711998 (-832A/G) and IL-17A rs2275913 (-197G/A) genotyping, no association with vitiligo development was found. In conclusion, the SNP rs763780 in the IL-17F gene appears to be a risk factor for vitiligo development in this Mexican population and it may be useful in future studies, especially for the development of new therapies.
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Affiliation(s)
- Natalia Aranza Zapata-Salazar
- Department of Dermatology, Facultad de Medicina y Hospital Universitario "Dr. Jose Eleuterio Gonzalez", Universidad Autonoma de Nuevo Leon (UANL), Av. Madero and Gonzalitos S/N, Mitras Centro, 64460, Monterrey, Nuevo Leon, Mexico
| | - David Emmanuel Kubelis-Lopez
- Department of Dermatology, Facultad de Medicina y Hospital Universitario "Dr. Jose Eleuterio Gonzalez", Universidad Autonoma de Nuevo Leon (UANL), Av. Madero and Gonzalitos S/N, Mitras Centro, 64460, Monterrey, Nuevo Leon, Mexico
| | | | - Celia Nohemi Sanchez-Dominguez
- Department of Biochemistry and Molecular Medicine, Facultad de Medicina y Hospital Universitario "Dr. Jose Eleuterio Gonzalez", Universidad Autonoma de Nuevo Leon (UANL), Monterrey, Nuevo Leon, Mexico
| | - Ana Cecilia Xolalpa-Rosales
- Facultad de Medicina y Hospital Universitario "Dr. Jose Eleuterio Gonzalez", Universidad Autonoma de Nuevo Leon (UANL), Monterrey, Nuevo Leon, Mexico
| | - Marely Eugenia Gomez-Galindo
- Facultad de Medicina y Hospital Universitario "Dr. Jose Eleuterio Gonzalez", Universidad Autonoma de Nuevo Leon (UANL), Monterrey, Nuevo Leon, Mexico
| | - Jorge Ocampo-Candiani
- Department of Dermatology, Facultad de Medicina y Hospital Universitario "Dr. Jose Eleuterio Gonzalez", Universidad Autonoma de Nuevo Leon (UANL), Av. Madero and Gonzalitos S/N, Mitras Centro, 64460, Monterrey, Nuevo Leon, Mexico.
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Giri PS, Begum R, Dwivedi M. Meta-analysis for association of TNFA-308(G > A) SNP with vitiligo susceptibility. Gene 2022; 809:146027. [PMID: 34673212 DOI: 10.1016/j.gene.2021.146027] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 10/09/2021] [Accepted: 10/14/2021] [Indexed: 02/07/2023]
Abstract
Vitiligo is an autoimmune progressive skin depigmenting disease. Tumor necrosis factor alpha (TNF-α) is a pro-inflammatory cytokine and plays a crucial role in vitiligo development. Since there are conflicting results and consensus is lacking for the association of the TNFA gene -308 G > A polymorphism with vitiligo susceptibility; we performed a meta-analysis of all the available studies to investigate the association of TNFA -308 G > A polymorphism with vitiligo risk. 11 studies involving 2199 vitiligo patients and 3083 controls were included in the meta-analysis. The meta-analysis revealed an increased vitiligo risk with "AA", "GA" and "AA" + "GA" genotypes and 'A' allele in the overall (p = 0.006, p = 0.003, p = 0.001 & p = 0.003) and Egyptian populations (p = 0.001, p < 0.00001, p < 0.00001 & p = 0.002). Moreover, we found association for "GA" and "AA" + "GA" genotypes in Asian population (p = 0.0009 & p = 0.005) and for 'A' allele in Asian and middle eastern populations (p = 0.04 & p = 0.0002). Interestingly the disease activity based analysis revealed significant association for "GA", "AA" + "GA" genotypes and 'A' allele with active vitiligo patients in the North American population (p = 0.02). Moreover, we found significant association for "GA", "AA" + "GA" genotypes and 'A' allele with localized vitiligo in overall (p = 0.02, p = 0.02 & p = 0.04) and Asian (p = 0.004, p = 0.003 & p = 0.01) populations. Overall, our meta-analysis suggests the involvement of susceptible 'A' allele with: i) vitiligo susceptibility in overall population and specifically with Asian, Middle Eastern and Egyptian populations; ii) vitiligo disease activity in North American population and iii) localized vitiligo in overall population and specifically in Asian population.
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Affiliation(s)
- Prashant S Giri
- C. G. Bhakta Institute of Biotechnology, Faculty of Science, Uka Tarsadia University, Bardoli, Surat 394 350, Gujarat, India
| | - Rasheedunnisa Begum
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara 390 002, Gujarat, India
| | - Mitesh Dwivedi
- C. G. Bhakta Institute of Biotechnology, Faculty of Science, Uka Tarsadia University, Bardoli, Surat 394 350, Gujarat, India.
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Dwivedi M, Laddha NC, Begum R. The Immunogenetics of Vitiligo: An Approach Toward Revealing the Secret of Depigmentation. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1367:61-103. [PMID: 35286692 DOI: 10.1007/978-3-030-92616-8_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Vitiligo is a hypomelanotic skin disease and considered to be of autoimmune origin due to breaching of immunological self-tolerance, resulting in inappropriate immune responses against melanocytes. The development of vitiligo includes a strong heritable component. Different strategies ranging from linkage studies to genome-wide association studies are used to explore the genetic factors responsible for the disease. Several vitiligo loci containing the respective genes have been identified which contribute to vitiligo and genetic variants for some of the genes are still unknown. These genes include mainly the proteins that play a role in immune regulation and a few other genes important for apoptosis and regulation of melanocyte functions. Despite the available data on genetic variants and risk alleles which influence the biological processes, only few immunological pathways have been found responsible for all ranges of severity and clinical manifestations of vitiligo. However, studies have concluded that vitiligo is of autoimmune origin and manifests due to complex interactions in immune components and their inappropriate response toward melanocytes. The genes involved in the immune regulation and processing the melanocytes antigen and its presentation can serve as effective immune-therapeutics that can target specific immunological pathways involved in vitiligo. This chapter highlights those immune-regulatory genes involved in vitiligo susceptibility and loci identified to date and their implications in vitiligo pathogenesis.
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Affiliation(s)
- Mitesh Dwivedi
- C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University, Tarsadi, Surat, 394350, Gujarat, India.
| | - Naresh C Laddha
- In Vitro Specialty Lab Pvt. Ltd, 205-210, Golden Triangle, Navrangpura, Ahmedabad, 380009, Gujarat, India
| | - Rasheedunnisa Begum
- Department of Biochemistry, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, Gujarat, India
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Tang X, Cheng H, Cheng L, Liang B, Chen M, Zheng X, Xiao F. An in-depth analysis reveals two new genetic variants on 22q11.2 associated with vitiligo in the Chinese Han population. Mol Biol Rep 2021; 48:5955-5964. [PMID: 34350550 DOI: 10.1007/s11033-021-06597-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 07/25/2021] [Indexed: 12/21/2022]
Abstract
BACKGROUND Vitiligo is a complex disease in which patchy depigmentation is the result of an autoimmune-induced loss of melanocytes in affected regions. On the basis of a genome-wide linkage analysis of vitiligo in the Chinese Han population, we previously showed significant evidence of a linkage between 22q12 and vitiligo. Our aim in the current study was to identify vitiligo susceptibility variants within an expanded region of the 22q12 locus. METHODS AND RESULTS An in-depth analysis of the expanded region of the 22q12 locus was performed by imputation using a large GWAS dataset consisting of 1117 cases and 1701 controls. Eight nominal SNPs were selected and genotyped in an independent cohort of Chinese Han individuals (2069 patients and 1370 control individuals) by using the Sequenom MassArray iPLEX1 system. The data were analyzed with PLINK 1.07 software. The C allele of rs730669 located in ZDHHC8/RTN4R showed a strong association with vitiligo (P = 3.25 × 10-8, OR = 0.81). The C allele of rs4820338 located in VPREB1 and the A allele of rs2051582 (a SNP reported in our previous study) located in IL2RB showed a suggestive association with vitiligo (P = 1.04 × 10-5, OR = 0.86; P = 1.78 × 10-6, OR = 1.27). The three identified SNPs showed independent associations with vitiligo in a conditional logistic regression analysis (all P < 1.0 × 10-5; all D' < 0.05 and r2 < 1.0 × 10-4). CONCLUSIONS The study reveals that two novel variants rs730669 (ZDHHC8/RTN4R) and rs4820338 (VPREB1) on 22q11.2 might confer susceptibility to vitiligo and affect disease subphenotypes. The presence of multiple independent variants emphasizes their important roles in the genetic pathogenesis of disease.
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Affiliation(s)
- Xianfa Tang
- Department of Dermatology and Institute of Dermatology at No. 1 Hospital, Anhui Medical University, 81 Meishan Road, Hefei, Anhui, China
- Key Laboratory of Dermatology, Ministry of Education, Hefei, China
- Inflammation and Immune Mediated Diseases Laboratory of Anhui Province, Hefei, China
| | - Hui Cheng
- Department of Dermatology and Institute of Dermatology at No. 1 Hospital, Anhui Medical University, 81 Meishan Road, Hefei, Anhui, China
- Key Laboratory of Dermatology, Ministry of Education, Hefei, China
- Inflammation and Immune Mediated Diseases Laboratory of Anhui Province, Hefei, China
| | - Lu Cheng
- Department of Dermatology and Institute of Dermatology at No. 1 Hospital, Anhui Medical University, 81 Meishan Road, Hefei, Anhui, China
- Key Laboratory of Dermatology, Ministry of Education, Hefei, China
- Inflammation and Immune Mediated Diseases Laboratory of Anhui Province, Hefei, China
| | - Bo Liang
- Department of Dermatology and Institute of Dermatology at No. 1 Hospital, Anhui Medical University, 81 Meishan Road, Hefei, Anhui, China
- Key Laboratory of Dermatology, Ministry of Education, Hefei, China
- Inflammation and Immune Mediated Diseases Laboratory of Anhui Province, Hefei, China
| | - Mengyun Chen
- Department of Dermatology and Institute of Dermatology at No. 1 Hospital, Anhui Medical University, 81 Meishan Road, Hefei, Anhui, China
- Key Laboratory of Dermatology, Ministry of Education, Hefei, China
- Inflammation and Immune Mediated Diseases Laboratory of Anhui Province, Hefei, China
| | - Xiaodong Zheng
- Department of Dermatology and Institute of Dermatology at No. 1 Hospital, Anhui Medical University, 81 Meishan Road, Hefei, Anhui, China
- Key Laboratory of Dermatology, Ministry of Education, Hefei, China
- Inflammation and Immune Mediated Diseases Laboratory of Anhui Province, Hefei, China
| | - Fengli Xiao
- Department of Dermatology and Institute of Dermatology at No. 1 Hospital, Anhui Medical University, 81 Meishan Road, Hefei, Anhui, China.
- Key Laboratory of Dermatology, Ministry of Education, Hefei, China.
- Inflammation and Immune Mediated Diseases Laboratory of Anhui Province, Hefei, China.
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Basher NS, Malik A, Aldakheel F, Chaudhary AA, Rudayni HA, Alkholief M, Alshamsan A. Deleterious effect of angiotensin-converting enzyme gene polymorphism in vitiligo patients. Saudi J Biol Sci 2021; 28:4478-4483. [PMID: 34354433 PMCID: PMC8324959 DOI: 10.1016/j.sjbs.2021.04.045] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 04/17/2021] [Accepted: 04/18/2021] [Indexed: 11/26/2022] Open
Abstract
Vitiligo is a rare skin condition caused by an immune reaction. Vitiligo can occur anywhere on the body. This proposed explanation of vitiligo makes it clear that vitiligo is not linked to any other autoimmune diseases. The polymorphisms of some genes present in the immune system play a major function in susceptibility of vitiligo. Meta-analysis studies have shown that the Angiotensin converting enzyme (ACE) gene insertion and deletion polymorphism is closely associated with vitiligo in many ethnicities. The connection between ACE gene and vitiligo is connected through the auto immune diseases and there are no genetic polymorphism studies have been carried out with ACE gene with vitiligo in the Saudi population. Previous studies show that vitiligo patients are more likely to also have an autoimmune disorder. The current study aims to investigate the I/D polymorphism in the ACE gene with diagnosed patients with vitiligo subjects. This is a case-control study carried out in the Saudi population with 100 vitiligo cases and 100 healthy controls. Genotyping was performed through polymerase chain reaction followed by 3% agarose gel electrophoresis. Genotype and allele frequencies were carried out with genetic mode of inheritances. Statistical analysis was performed considering p < 0.05 as significant association. There was a substantial difference in allele frequency distribution between vitiligo patients and healthy controls (OR-1.70 (95%CI: 1.14-2.53); p = 0.008). Additionally, DD genotype (OR-4.71 (95%CI: 1.42-15.61); p = 0.008) and recessive model (OR-2.66 (95%CI: 1.41-5.02); p = 0.002) was strongly associated. Both dominant and co-dominant showed the negative association (p > 0.05) when compared between the vitiligo cases and controls. The correlation between age and genotyping was performed with Anova analysis and current study results confirmed the substantial link between 11 and 20 years (p = 0.01) and 31-40 years (p = 0.04) with the defined age groups. In conclusion, in Saudi populations, the ACE gene I/D polymorphism was identified as being correlated with vitiligo. This is the first study in Saudi Arabia to report the risk factors of vitiligo with the ACE gene polymorphism.
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Affiliation(s)
- Nosiba Suliman Basher
- Department of Biology, College of Science, Imam Mohammad Ibn Saud Islamic University, Riyadh, Saudi Arabia
| | - Abdul Malik
- Nanobiotechnology Unit, Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia.,Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Fahad Aldakheel
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, 11564, Saudi Arabia.,Prince Sattam Chair for Epidemiology and Public Health Research, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Anis Ahmad Chaudhary
- Department of Biology, College of Science, Imam Mohammad Ibn Saud Islamic University, Riyadh, Saudi Arabia
| | - Hassan Ahmad Rudayni
- Department of Biology, College of Science, Imam Mohammad Ibn Saud Islamic University, Riyadh, Saudi Arabia
| | - Musaed Alkholief
- Nanobiotechnology Unit, Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Aws Alshamsan
- Nanobiotechnology Unit, Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
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Martínez-Ramírez OC, Salazar-Piña DA, de Lorena RGM, Castro-Hernández C, Casas-Ávila L, Portillo-Jacobo JA, Rubio J. Association of NFκβ, TNFα, IL-6, IL-1β, and LPL Polymorphisms with Type 2 Diabetes Mellitus and Biochemical Parameters in a Mexican Population. Biochem Genet 2021; 59:940-965. [PMID: 33599871 DOI: 10.1007/s10528-021-10047-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 02/02/2021] [Indexed: 10/22/2022]
Abstract
Chronic low-grade inflammation is strongly related to the etiology of diabetes mellitus type 2 (T2DM), and the expression of inflammatory cytokines may be modulated by polymorphisms located in the regulatory regions of the NFκβ, IL-1β, IL-6, TNFα, and LPL genes. We considered it particularly important to investigate the relationship of gene polymorphisms involved in chronic inflammation with the risk of T2DM or uncontrolled biochemical parameters. METHODS We included 199 individuals with a T2DM diagnosis and 213 individuals without a T2DM diagnosis. Restriction fragment length polymorphism (RFLP) analyses were used to assess polymorphisms. RESULTS We found a risk association between T2DM and uncontrolled biochemical parameters in a Mexican population for the genotypes del/del of NFκβ, -174 and -572 of IL-6, C/C of IL-1β, -308 and -238 of TNFα, and T/T of LPL. In subjects without diabetes (controls), we found an association between the G/C genotype of the -572 polymorphism and the G/C and C/C genotypes of the -597 polymorphism of IL-6 with the risk of glucose levels > 131 mg/dL. Genotype C/C of polymorphism -174 of the IL-6 gene was associated with high triglyceride levels, and levels > 5.8% of HbA1c were associated with the G/A genotype of TNFα -308. CONCLUSION Here, we describe for the first time the relationship of T2DM risk and uncontrolled biochemical parameters with polymorphisms in the NFκβ, IL-6, TNFα, IL-1β, and LPL genes in a Mexican population. We also showed that for the population included in this study, there is an additive effect of the polymorphisms of the studied genes that considerably increases the risk of developing T2DM.We also showed that there are interactions between genes related to chronic inflammation that affect the risk of T2DM.
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Affiliation(s)
- O C Martínez-Ramírez
- Facultad de Nutrición, Universidad Autónoma del Estado de Morelos, Río Iztacihuatl S/N. Col. Vista Hermosa, C.P. 62350, Mexico, Mexico.
| | - D A Salazar-Piña
- Facultad de Nutrición, Universidad Autónoma del Estado de Morelos, Río Iztacihuatl S/N. Col. Vista Hermosa, C.P. 62350, Mexico, Mexico
| | - Ramos-García M de Lorena
- Facultad de Nutrición, Universidad Autónoma del Estado de Morelos, Río Iztacihuatl S/N. Col. Vista Hermosa, C.P. 62350, Mexico, Mexico
| | - C Castro-Hernández
- Departamento de Medicina Genómica y Toxicología Ambiental, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Apartado Postal 70228, C.P. 04510, Ciudad de México, Mexico
| | - L Casas-Ávila
- Departamento de Genética, Instituto Nacional de Rehabilitación, C.P. 14389, Ciudad de México, Mexico
| | - J A Portillo-Jacobo
- Facultad de Nutrición, Universidad Autónoma del Estado de Morelos, Río Iztacihuatl S/N. Col. Vista Hermosa, C.P. 62350, Mexico, Mexico
| | - J Rubio
- Departamento de Medicina Genómica y Toxicología Ambiental, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Apartado Postal 70228, C.P. 04510, Ciudad de México, Mexico
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